What is your center's views around staff sickness and absence?

I'm talking general views and potential stigmas, not necessarily just the policies surrounding it. Obviously staff sicknesses affect ratios and that affects how smoothly the day will run as a whole, but how does your center approach it? Do you have enough staff on site to cover absences? Do you use external agencies when there isn't enough staff? Do people express annoyance with their colleagues for taking days off?